PSI-MOD is an ontology consisting of terms that describe protein chemical modifications, logically linked by an is_a relationship in such a way as to form a direct acyclic graph (DAG). The PSI-MOD ontology has more than 45 top-level nodes, and provides alternative hierarchical paths for classifying protein modifications either by the molecular structure of the modification, or by the amino acid residue that is modified.


mod.owl PSI-MOD.owl PSI-MOD Ontology, OWL format
mod.obo PSI-MOD.obo PSI-MOD Ontology, OBO format

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